[E12-15-001] Elastics for VCS experiment

[Nikos Sparveris]

Yes Mark, agreed!
Hamza, please update the run plan accordingly.

N.

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Nikos Sparveris
Associate Professor

Physics Department, Temple University
1925 N. 12th Street
Philadelphia, PA 19122-1801

Phone: +1-215-204-7425
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On Tue, Jul 2, 2019 at 12:54 PM Mark Jones <jones at jlab.org> wrote:

> I would suggest that we do elastic for a range of the HMS momentum
> that we are using in VCS.
>
> Ebeam     q2    HMS mom HMS ang  SHMS mom   SHMS ang
>  4.5500  0.543     0.790          63.8          4.261             9.60
>  4.5500  0.687     0.900          60.8          4.184           10.90
>  4.5500  0.818     1.00            58.4          4.114           12.00
>
> We should do this first to check out the coincidence timing.
> The HMS timing will shift about 30-40 ns compared to the electrons
> that are presently in the HMS. I talked to Brad, so he will be available
> to adjust the coincidence trigger timing.
> We should do one run with singles SHMS trigger and then one run with
> coincidence
> trigger so that we can measure the losses due to proton nuclear
> interactions at
> these momentum.
> The rates are very high. So this should not take to long.
> Given the high rates , it might be useful to take a run with the sieve in
> the SHMS.
>
> CHeers,
>             Mark
>
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